diff --git a/src/board.rs b/src/board.rs
index 054ae79..33d2aa9 100644
--- a/src/board.rs
+++ b/src/board.rs
@@ -138,6 +138,8 @@ impl Board {
                 .map(|range| range.into_iter().map(|j| (i, j)).collect()),
         );
 
+        // TODO! diagonals completely broken :(
+
         // handle diagonals
         chains.extend(
             i_chain